AUM power cut tests fail sporadically

Background

This test fail sporadically, specially on Up Squared one as shown in

#469 (closed)

The test fails with logs like:

#190 (comment 67663)

Reproducibility

How often the issue is hit when repeating the test and changing nothing (same device, same image, etc.)?

Put the ✅ in the most appropriate entry:

1. always
2. ✅ often, but not always
3. rarely

Impact of bug

How severe is the bug? Does it render an image unbootable? Is it a security issue? Does it prevent specific applications from working? What is the impact? Does this bug affect a critical component? Does it cause something else to not work? How often is the bug likely to be found by a user? For example, every boot or once per year?

Attachments

Add further information about the environment in the form of attachments here. Attach plain text files from log output (from journalctl, systemctl, …) or long backtraces as attached files. If adding comments on the log is required create a new snippet and add the link to it here.

Screenshots and videos are usually useful for graphic issues.

Root cause

Race condition in the test

Outcomes

tests/aum-offline-upgrade!58 (merged)

tests/aum-offline-upgrade!60 (merged)

tests/aum-offline-upgrade!61 (merged)

Management data

This section is for management only, it should be the last one in the description.

/cc @andrunko @em @sagar @sudarshan @wlozano

Phabricator link: https://phabricator.apertis.org/T9324